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Koji TSUMURA (ICTP) DESY theory workshop 1/10/2009
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Transcript of Koji TSUMURA (ICTP) DESY theory workshop 1/10/2009
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Models of Yukawa interaction in the two Higgs doublet model, and their collider phenomenology M. Aoki, S. Kanemura, K. Tsumura and K. Yagyu Phys. Rev. D80 015017 (2009)
Koji TSUMURA (ICTP)
DESY theory workshop 1/10/2009
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2Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
Outline
Leptophilic Higgs bosons
Types of Yukawa iteraction
Higgs decays
Experimental constraints
Collider phenomenology (for 2HDM-X)
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3Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
Introduction
Problems in Lepton sector? Tiny neutirno mass
3 sigma excess in Muon g-2
Leptonic cosmic ray @ PAMELA, FERMI
These problems can be solved by extensions of Higgs sector.
Leptophilic Higgs bosons are potentially interesting
Practically interesting @ LHC Clear leptonic signal @ hadron colliders
Avoid strong constraints from quark sector (esp., B-phys)
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4Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
Two Higgs doublet models (2HDMs)
General 2HDM tree level FCNC
Adding extra Z2 sym.
No FCNC
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5Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
Types of 2HDMs
There are 4 possible Z2 assignments Type-I:SM-like, universal 1:none, 2:u,d,l (all)
Type-II:Higgs sector of MSSM1:d, l, 2:u
Type-X1:l (leptons)2:u,d (quarks)
H,A,H+ can be leptophilic for tanb >>1.
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6Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
Hereafter, we take SM like limit [sin(a-b)=-1] . h (SM-like) decay is independent of types of Yukawa interaction in
2HDM. (essetially the same as SM)
From rho-parameter constraint, mH~mA~mH+ is favored.
We concentrate extra Higgs (H/A, H+) phenomenology in Type-II (MSSM) and Type-X (leptophilic) 2HDM.
tanb enhancement only for leptons
Usual tanb enhancement in SUSY models
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7Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
2HDM as an effective theory
Problems in Lepton sector? Tiny neutirno mass
3-loop neutrino mass, light H+, by Aoki et al. PRL102:051805,2009
3 sigma excess in Muon g-2
Light A with high tanb, by Cao et al. arXiv:0909.5148
Leptonic cosmic ray @ PAMELA, FERMI
Higgs as a messenger of DM by Goh et al. JHEP 0905:097,2009
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9Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
A decay
A (H) mainly decays bb () in Type-II (-X).
Leptophilic(MSSM-like)
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10Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
Constraints
* Direct seacrh: typically mH,mA,mH+ > 100GeV
* Indirect bounds - b →s
- B →
- →
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11Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
b →s
chargino-stop loop can cancel this contribution in MSSM Light charged Higgs boson is still possible for MSSM.
Type-II
In addition to C7W (SM W boson loop),
mH+ > 300GeVLight H+ is disfavored for Type-II.
Constant for wide range of tanb.
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12Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
b →s
Light charged Higgs is allowedfor Type-X in tanb>2.
Type-X
In addition to C7W (SM W boson loop), small contrib. for tanb>2.
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13Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
B →
Stringent constraint on only for Type-II
Type-II
tanb^2 enhancement!!
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14Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
B →
Stringent constraint on only for Type-II
For Type-X, no bounds
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leptonic decay
milder boundsfor both Type-II and -X
Light charged Higgs (mH+ ~ 100GeV) is allowed for Type-X
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16Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
Collider signals
* t H+ b (light charged Higgs boson)
* gg A/H
* qq/gg bbA/bbH
* qq AH
* qq’ AH+
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17Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
gg A/H
Detection mode is A/H
MSSM: significant for both small and large tanbType-X: xsec. becomes small for large tanb.
MSSM: A/Hbb.Type-X: A/H for tanb>2.
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18Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
gg A/H
Type-X with small tanb(~2) and
MSSM with large (or very small) tanb can be identified. (30fb^-1)
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19Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
qq/gg -> bbA/bbH -> bb tau tau
MSSM: enhanced by tanbType-X: suppressed by tanb.
MSSM: A/Hbb.Type-X: A/H for tanb>2.
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20Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
qq/gg -> bbA/bbH -> bb tau tau
Signal can be found only in MSSM with large tanb. (30fb^-1)
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21Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
Complementality
Type-X with small tanb can be distinguished from MSSM (with large tanb)
In Type-X with moderate (and large) tanb, we must go other processes, such as qq AH (AH+) ().
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22Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
Summary
Type-X (leptophilic) 2HDM might be interesting.
Light charged Higgs boson is allowed.
Characteristic signals can be found at the LHC!!
(leptonic decays are enhanced !!)
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23Koji Tsumura (ICTP)Theory Workshop, 1 Oct 2009, DESY
-parameter
In the SM (top-bottom, Higgs-gauge loop)
In the 2HDM (in addition, Higgs-Higgs loop)
Favorable parameter region